#include<stdio.h>


int main(void)
{
    int a=3;

    double b=4.9;

    printf("5.0*3.0=%f\n",5.0*3.0);

    printf("3*b=%f\n",3*b);

    printf("a*b=%f\n",a*b);
    printf("3*20=%d\n",3*20);


    return 0;




}
